UBUNTU-CVE-2021-28701

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Source
https://ubuntu.com/security/CVE-2021-28701
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28701.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-28701
Upstream
Published
2021-09-08T14:15:00Z
Modified
2025-09-08T16:47:04Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Another race in XENMAPSPACEgranttable handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

References

Affected packages

Ubuntu:Pro:16.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.6.5-0ubuntu1.4?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.5.1-0ubuntu1
4.5.1-0ubuntu2
4.6.0-1ubuntu1
4.6.0-1ubuntu2
4.6.0-1ubuntu4
4.6.0-1ubuntu4.1
4.6.0-1ubuntu4.2
4.6.0-1ubuntu4.3
4.6.5-0ubuntu1
4.6.5-0ubuntu1.1
4.6.5-0ubuntu1.2
4.6.5-0ubuntu1.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "libxen-4.6"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "libxenstore3.0"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.4-amd64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.4-arm64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.4-armhf"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.5-amd64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.5-arm64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.5-armhf"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.6-amd64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.6-arm64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.6-armhf"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-utils-4.6"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xenstore-utils"
        }
    ]
}

Ubuntu:Pro:18.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.9.2-0ubuntu1?arch=source&distro=esm-infra/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.9.0-0ubuntu3
4.9.0-0ubuntu4
4.9.2-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "libxen-4.9"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "libxenstore3.0"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.6-amd64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.6-arm64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.6-armhf"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.7-amd64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.7-arm64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.7-armhf"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.8-amd64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.8-arm64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.8-armhf"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.9-amd64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.9-arm64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.9-armhf"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-utils-4.9"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xenstore-utils"
        }
    ]
}

Ubuntu:Pro:20.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.11.3+24-g14b62ab3e5-1ubuntu2.3?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.9.2-0ubuntu2
4.9.2-0ubuntu6
4.9.2-0ubuntu7
4.11.3+24-g14b62ab3e5-1ubuntu1
4.11.3+24-g14b62ab3e5-1ubuntu2
4.11.3+24-g14b62ab3e5-1ubuntu2.2
4.11.3+24-g14b62ab3e5-1ubuntu2.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxencall1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxendevicemodel1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenevtchn1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenforeignmemory1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxengnttab1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenmisc4.11"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenstore3.0"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxentoolcore1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxentoollog1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.11-amd64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.11-arm64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.11-armhf"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.9-amd64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.9-arm64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.9-armhf"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-common"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-utils-4.11"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xenstore-utils"
        }
    ]
}

Ubuntu:22.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.16.0-1~ubuntu2.1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.11.4+24-gddaaccbbab-1ubuntu2
4.16.0-1~ubuntu2
4.16.0-1~ubuntu2.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxencall1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxendevicemodel1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxenevtchn1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxenforeignmemory1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxengnttab1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxenhypfs1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxenmisc4.16"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxenstore4"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxentoolcore1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxentoollog1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-hypervisor-4.16-amd64"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-hypervisor-4.16-arm64"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-hypervisor-4.16-armhf"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-hypervisor-common"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-utils-4.16"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xenstore-utils"
        }
    ]
}

Ubuntu:24.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.17.3+10-g091466ba55-1.1ubuntu3?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.17.2-1
4.17.2+55-g0b56bed864-1
4.17.2+76-ge1f9cb16e2-1
4.17.2+76-ge1f9cb16e2-1ubuntu1
4.17.3+10-g091466ba55-1
4.17.3+10-g091466ba55-1.1ubuntu2
4.17.3+10-g091466ba55-1.1ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxencall1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxendevicemodel1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxenevtchn1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxenforeignmemory1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxengnttab1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxenhypfs1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxenmisc4.17t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxenstore4t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxentoolcore1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxentoollog1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-hypervisor-4.17-amd64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-hypervisor-4.17-arm64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-hypervisor-4.17-armhf"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-hypervisor-common"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-utils-4.17"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xenstore-utils"
        }
    ]
}

Ubuntu:25.04 / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.20.0-1ubuntu1?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.17.3+10-g091466ba55-1.1ubuntu3
4.19.1-1ubuntu3
4.20.0-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxencall1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxendevicemodel1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxenevtchn1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxenforeignmemory1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxengnttab1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxenhypfs1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxenmisc4.20"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxenstore4"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxentoolcore1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxentoollog1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-hypervisor-4.20-amd64"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-hypervisor-4.20-arm64"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-hypervisor-common"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-utils-4.20"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xenstore-utils"
        }
    ]
}